Asciify.psm1
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# Copyright 2019 Tobias Heilig # # Redistribution and use in source and binary forms, with or without modification, are # permitted provided that the following conditions are met: # # 1. Redistributions of source code must retain the above copyright notice, this list # of conditions and the following disclaimer. # 2. Redistributions in binary form must reproduce the above copyright notice, this list # of conditions and the following disclaimer in the documentation and/or other materials # provided with the distribution. # 3. Neither the name of the copyright holder nor the names of its contributors may be used # to endorse or promote products derived from this software without specific prior written # permission. # # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY # AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER # IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT # OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Add-Type -AssemblyName System.Drawing <# .SYNOPSIS Convert image to ascii. .DESCRIPTION Convert any image to ascii picture by representing each pixels grayscale value as an ascii character. .PARAMETER Path The path to the image to process. .PARAMETER Resolution The amount of different ascii characters the grayscale values will be assigned to. .PARAMETER Width Set the width of the output ascii picture manually. .PARAMETER Height Set the height of the output ascii picture manually. .PARAMETER FitConsoleHeight Whether the output ascii picture should fit the console height instead of width. Only applicable if width and height are not explicitly specified. .PARAMETER Invert Whether the output ascii picture should be inverted. Use this on light console backgrounds for better results. .INPUTS System.IO.FileInfo System.String System.Int32 .OUTPUTS System.String .COMPONENT GDI+ .EXAMPLE Convert-ImageToAscii C:\Users\Bobby\Pictures\bobby-fischer.jpg .EXAMPLE Convert-ImageToAscii -Path C:\Users\Bobby\Pictures\bobby-fischer.jpg -Resolution Mid -FitConsoleHeight .EXAMPLE Convert-ImageToAscii -Path C:\Users\Bobby\Pictures\bobby-fischer.jpg -Width 120 -Height 80 -Invert .EXAMPLE Get-ChildItem C:\Users\Bobby\Pictures\*.jpg | Convert-ImageToAscii -FitConsoleHeight #> function Convert-ImageToAscii { [Alias('i2a')] [OutputType([string])] [CmdletBinding()] param( [Parameter(Mandatory, Position=0, ValueFromPipeline)] [ValidateScript({ $PSItem | Test-Path -PathType Leaf })] [ValidateScript({ $PSItem.Extension -in '.bmp', '.gif', '.jpeg', '.jpg', '.png', '.tiff' })] [System.IO.FileInfo] $Path, [ValidateSet('Low', 'Mid', 'High')] [string] $Resolution='Low', [Parameter(Mandatory, ParameterSetName="SetDimensionsManually")] [ValidateRange(1, [int]::MaxValue)] [int] $Width, [Parameter(Mandatory, ParameterSetName="SetDimensionsManually")] [ValidateRange(1, [int]::MaxValue)] [int] $Height, [Parameter(ParameterSetName="SetDimensionsAutomatically")] [switch] $FitConsoleHeight, [switch] $Invert ) begin { $symbols = $(if ($Invert.IsPresent) { @{ Low = '@#+. ' Mid = '@%#*+:,. ' High = '@%#omCXxt?+~;:,. ' } } else { @{ Low = ' .+#@' Mid = ' .,:+*#%@' High = ' .,:;~+?txXCmo#%@' } })[$Resolution] } process { try { $img = [Drawing.Image]::FromFile($(Resolve-Path -Path $Path)) [int]$w, [int]$h = switch ($PSCmdlet.ParameterSetName) { SetDimensionsManually { ($Width / 2), $Height } SetDimensionsAutomatically { @(($Host.UI.RawUI.WindowSize.Height * ($img.Width / $img.Height)) ($Host.UI.RawUI.WindowSize.Height - 4)) } default { @(($Host.UI.RawUI.WindowSize.Width / 2 - 1) ($Host.UI.RawUI.WindowSize.Width / 2 / ($img.Width / $img.Height))) } } $bmp = [Drawing.Bitmap]::New($w, $h) $bmp.SetResolution($img.HorizontalResolution, $img.VerticalResolution) $rec = [Drawing.Rectangle]::New(0, 0, $w, $h) $wrapMode = [Drawing.Imaging.ImageAttributes]::New() $wrapMode.SetWrapMode([Drawing.Drawing2D.WrapMode]::TileFlipXY) $graphics = [Drawing.Graphics]::FromImage($bmp) $graphics.CompositingMode = [Drawing.Drawing2D.CompositingMode]::SourceCopy $graphics.CompositingQuality = [Drawing.Drawing2D.CompositingQuality]::HighQuality $graphics.InterpolationMode = [Drawing.Drawing2D.InterpolationMode]::HighQualityBicubic $graphics.SmoothingMode = [Drawing.Drawing2D.SmoothingMode]::HighQuality $graphics.PixelOffsetMode = [Drawing.Drawing2D.PixelOffsetMode]::HighQuality $graphics.DrawImage($img, $rec, 0, 0, $img.Width, $img.Height, [Drawing.GraphicsUnit]::Pixel, $wrapMode) $ascii = [System.Text.StringBuilder]::New() foreach ($y in 0..($bmp.Height-1)) { foreach ($x in 0..($bmp.Width-1)) { $p = $bmp.GetPixel($x, $y) $symbol = "$($symbols[[Math]::Floor((($p.R+$p.G+$p.B)/3)/(256/$symbols.Length))])" * 2 [void]$ascii.Append($symbol) } [void]$ascii.Append("`n") } $ascii.ToString() } finally { $wrapMode.Dispose() $graphics.Dispose() $bmp.Dispose() $img.Dispose() } } } |